<?php

/*!
 * cssmin.php rev 91c5ea5
 * Author: Tubal Martin - http://blog.margenn.com/
 * Repo: https://github.com/tubalmartin/YUI-CSS-compressor-PHP-port
 *
 * This is a PHP port of the Javascript port of the CSS minification tool
 * distributed with YUICompressor, itself a port of the cssmin utility by
 * Isaac Schlueter - http://foohack.com/
 * Permission is hereby granted to use the PHP version under the same
 * conditions as the YUICompressor.
 */

/*!
 * YUI Compressor
 * http://developer.yahoo.com/yui/compressor/
 * Author: Julien Lecomte - http://www.julienlecomte.net/
 * Copyright (c) 2011 Yahoo! Inc. All rights reserved.
 * The copyrights embodied in the content of this file are licensed
 * by Yahoo! Inc. under the BSD (revised) open source license.
 */

class CSSmin
{
	const NL = '___YUICSSMIN_PRESERVED_NL___';
	const TOKEN = '___YUICSSMIN_PRESERVED_TOKEN_';
	const COMMENT = '___YUICSSMIN_PRESERVE_CANDIDATE_COMMENT_';
	const CLASSCOLON = '___YUICSSMIN_PSEUDOCLASSCOLON___';

	private $comments;
	private $preserved_tokens;
	private $memory_limit;
	private $max_execution_time;
	private $pcre_backtrack_limit;
	private $pcre_recursion_limit;
	private $raise_php_limits;

	/**
	 * @param bool|int $raise_php_limits
	 * If true, PHP settings will be raised if needed
	 */
	public function __construct($raise_php_limits = TRUE)
	{
		// Set suggested PHP limits
		$this->memory_limit = 128 * 1048576; // 128MB in bytes
		$this->max_execution_time = 60; // 1 min
		$this->pcre_backtrack_limit = 1000 * 1000;
		$this->pcre_recursion_limit =  500 * 1000;

		$this->raise_php_limits = (bool) $raise_php_limits;
	}

	/**
	 * Minify a string of CSS
	 * @param string $css
	 * @param int|bool $linebreak_pos
	 * @return string
	 */
	public function run($css = '', $linebreak_pos = FALSE)
	{
		if (empty($css)) {
			return '';
		}

		if ($this->raise_php_limits) {
			$this->do_raise_php_limits();
		}

		$this->comments = array();
		$this->preserved_tokens = array();

		$start_index = 0;
		$length = strlen($css);

		$css = $this->extract_data_urls($css);

		// collect all comment blocks...
		while (($start_index = $this->index_of($css, '/*', $start_index)) >= 0) {
														$end_index = $this->index_of($css, '*/', $start_index + 2);
			if ($end_index < 0) {
				$end_index = $length;
			}
		$comment_found = $this->str_slice($css, $start_index + 2, $end_index);
		$this->comments[] = $comment_found;
		$comment_preserve_string = self::COMMENT . (count($this->comments) - 1) . '___';
		$css = $this->str_slice($css, 0, $start_index + 2) . $comment_preserve_string . $this->str_slice($css, $end_index);
		// Set correct start_index: Fixes issue #2528130
		$start_index = $end_index + 2 + strlen($comment_preserve_string) - strlen($comment_found);
	}

	// preserve strings so their content doesn't get accidentally minified
	$css = preg_replace_callback('/(?:"(?:[^\\\\"]|\\\\.|\\\\)*")|'."(?:'(?:[^\\\\']|\\\\.|\\\\)*')/S", array($this, 'replace_string'), $css);

	// Let's divide css code in chunks of 25.000 chars aprox.
	// Reason: PHP's PCRE functions like preg_replace have a "backtrack limit"
	// of 100.000 chars by default (php < 5.3.7) so if we're dealing with really
	// long strings and a (sub)pattern matches a number of chars greater than
	// the backtrack limit number (i.e. /(.*)/s) PCRE functions may fail silently
	// returning NULL and $css would be empty.
	$charset = '';
	$charset_regexp = '/@charset [^;]+;/i';
	$css_chunks = array();
	$css_chunk_length = 25000; // aprox size, not exact
	$start_index = 0;
	$i = $css_chunk_length; // save initial iterations
	$l = strlen($css);


	// if the number of characters is 25000 or less, do not chunk
	if ($l <= $css_chunk_length) {
		$css_chunks[] = $css;
	} else {
		// chunk css code securely
		while ($i < $l) {
			$i += 50; // save iterations. 500 checks for a closing curly brace }
		if ($l - $start_index <= $css_chunk_length || $i >= $l) {
			$css_chunks[] = $this->str_slice($css, $start_index);
			break;
		}
		if ($css[$i - 1] === '}' && $i - $start_index > $css_chunk_length) {
			// If there are two ending curly braces }} separated or not by spaces,
			// join them in the same chunk (i.e. @media blocks)
			$next_chunk = substr($css, $i);
		if (preg_match('/^\s*\}/', $next_chunk)) {
			$i = $i + $this->index_of($next_chunk, '}') + 1;
		}

		$css_chunks[] = $this->str_slice($css, $start_index, $i);
		$start_index = $i;
	}
}
}

// Minify each chunk
for ($i = 0, $n = count($css_chunks); $i < $n; $i++) {
	$css_chunks[$i] = $this->minify($css_chunks[$i], $linebreak_pos);
	// Keep the first @charset at-rule found
	if (empty($charset) && preg_match($charset_regexp, $css_chunks[$i], $matches)) {
		$charset = $matches[0];
	}
	// Delete all @charset at-rules
	$css_chunks[$i] = preg_replace($charset_regexp, '', $css_chunks[$i]);
}

// Update the first chunk and push the charset to the top of the file.
$css_chunks[0] = $charset . $css_chunks[0];

return implode('', $css_chunks);
}

/**
 * Sets the memory limit for this script
 * @param int|string $limit
 */
public function set_memory_limit($limit)
{
	$this->memory_limit = $this->normalize_int($limit);
}

/**
 * Sets the maximum execution time for this script
 * @param int|string $seconds
 */
public function set_max_execution_time($seconds)
{
	$this->max_execution_time = (int) $seconds;
}

/**
 * Sets the PCRE backtrack limit for this script
 * @param int $limit
 */
public function set_pcre_backtrack_limit($limit)
{
	$this->pcre_backtrack_limit = (int) $limit;
}

/**
 * Sets the PCRE recursion limit for this script
 * @param int $limit
 */
public function set_pcre_recursion_limit($limit)
{
	$this->pcre_recursion_limit = (int) $limit;
}

/**
 * Try to configure PHP to use at least the suggested minimum settings
 */
private function do_raise_php_limits()
{
	$php_limits = array(
			'memory_limit' => $this->memory_limit,
			'max_execution_time' => $this->max_execution_time,
			'pcre.backtrack_limit' => $this->pcre_backtrack_limit,
			'pcre.recursion_limit' =>  $this->pcre_recursion_limit
			);

	// If current settings are higher respect them.
	foreach ($php_limits as $name => $suggested) {
		$current = $this->normalize_int(ini_get($name));
		// memory_limit exception: allow -1 for "no memory limit".
		if ($current > -1 && ($suggested == -1 || $current < $suggested)) {
			ini_set($name, $suggested);
		}
	}
}

/**
 * Does bulk of the minification
 * @param string $css
 * @param int|bool $linebreak_pos
 * @return string
 */
private function minify($css, $linebreak_pos)
{
	// strings are safe, now wrestle the comments
	for ($i = 0, $max = count($this->comments); $i < $max; $i++) {

		$token = $this->comments[$i];
		$placeholder = '/' . self::COMMENT . $i . '___/';

		// ! in the first position of the comment means preserve
		// so push to the preserved tokens keeping the !
		if (substr($token, 0, 1) === '!') {
			$this->preserved_tokens[] = $token;
			$token_tring = self::TOKEN . (count($this->preserved_tokens) - 1) . '___';
			$css = preg_replace($placeholder, $token_tring, $css, 1);
			// Preserve new lines for /*! important comments
			$css = preg_replace('/\s*[\n\r\f]+\s*(\/\*'. $token_tring .')/S', self::NL.'$1', $css);
			$css = preg_replace('/('. $token_tring .'\*\/)\s*[\n\r\f]+\s*/S', '$1'.self::NL, $css);
			continue;
		}

		// \ in the last position looks like hack for Mac/IE5
		// shorten that to /*\*/ and the next one to /**/
		if (substr($token, (strlen($token) - 1), 1) === '\\') {
			$this->preserved_tokens[] = '\\';
			$css = preg_replace($placeholder,  self::TOKEN . (count($this->preserved_tokens) - 1) . '___', $css, 1);
			$i = $i + 1; // attn: advancing the loop
			$this->preserved_tokens[] = '';
			$css = preg_replace('/' . self::COMMENT . $i . '___/',  self::TOKEN . (count($this->preserved_tokens) - 1) . '___', $css, 1);
			continue;
		}

		// keep empty comments after child selectors (IE7 hack)
		// e.g. html >/**/ body
		if (strlen($token) === 0) {
			$start_index = $this->index_of($css, $this->str_slice($placeholder, 1, -1));
			if ($start_index > 2) {
				if (substr($css, $start_index - 3, 1) === '>') {
					$this->preserved_tokens[] = '';
					$css = preg_replace($placeholder,  self::TOKEN . (count($this->preserved_tokens) - 1) . '___', $css, 1);
				}
			}
		}

		// in all other cases kill the comment
		$css = preg_replace('/\/\*' . $this->str_slice($placeholder, 1, -1) . '\*\//', '', $css, 1);
	}


	// Normalize all whitespace strings to single spaces. Easier to work with that way.
	$css = preg_replace('/\s+/', ' ', $css);

	// Shorten & preserve calculations calc(...) since spaces are important
	$css = preg_replace_callback('/calc(\((?:[^\(\)]+|(?1))*\))/i', array($this, 'replace_calc'), $css);

	// Replace positive sign from numbers preceded by : or a white-space before the leading space is removed
	// +1.2em to 1.2em, +.8px to .8px, +2% to 2%
	$css = preg_replace('/((?<!\\\\)\:|\s)\+(\.?\d+)/S', '$1$2', $css);

	// Remove leading zeros from integer and float numbers preceded by : or a white-space
	// 000.6 to .6, -0.8 to -.8, 0050 to 50, -01.05 to -1.05
	$css = preg_replace('/((?<!\\\\)\:|\s)(\-?)0+(\.?\d+)/S', '$1$2$3', $css);

	// Remove trailing zeros from float numbers preceded by : or a white-space
	// -6.0100em to -6.01em, .0100 to .01, 1.200px to 1.2px
	$css = preg_replace('/((?<!\\\\)\:|\s)(\-?)(\d?\.\d+?)0+([^\d])/S', '$1$2$3$4', $css);

	// Remove trailing .0 -> -9.0 to -9
	$css = preg_replace('/((?<!\\\\)\:|\s)(\-?\d+)\.0([^\d])/S', '$1$2$3', $css);

	// Replace 0 length numbers with 0
	$css = preg_replace('/((?<!\\\\)\:|\s)\-?\.?0+([^\d])/S', '${1}0$2', $css);

	// Remove the spaces before the things that should not have spaces before them.
	// But, be careful not to turn "p :link {...}" into "p:link{...}"
	// Swap out any pseudo-class colons with the token, and then swap back.
	$css = preg_replace_callback('/(?:^|\})(?:(?:[^\{\:])+\:)+(?:[^\{]*\{)/', array($this, 'replace_colon'), $css);
	$css = preg_replace('/\s+([\!\{\}\;\:\>\+\(\)\]\~\=,])/', '$1', $css);
	$css = preg_replace('/' . self::CLASSCOLON . '/', ':', $css);

	// retain space for special IE6 cases
	$css = preg_replace('/\:first\-(line|letter)(\{|,)/i', ':first-$1 $2', $css);

	// no space after the end of a preserved comment
	$css = preg_replace('/\*\/ /', '*/', $css);

	// Put the space back in some cases, to support stuff like
	// @media screen and (-webkit-min-device-pixel-ratio:0){
	$css = preg_replace('/\band\(/i', 'and (', $css);

			// Remove the spaces after the things that should not have spaces after them.
			$css = preg_replace('/([\!\{\}\:;\>\+\(\[\~\=,])\s+/S', '$1', $css);

			// remove unnecessary semicolons
			$css = preg_replace('/;+\}/', '}', $css);

			// Fix for issue: #2528146
			// Restore semicolon if the last property is prefixed with a `*` (lte IE7 hack)
			// to avoid issues on Symbian S60 3.x browsers.
			$css = preg_replace('/(\*[a-z0-9\-]+\s*\:[^;\}]+)(\})/', '$1;$2', $css);

			// Replace 0 length units 0(px,em,%) with 0.
			$css = preg_replace('/((?<!\\\\)\:|\s)\-?0(?:em|ex|ch|rem|vw|vh|vm|vmin|cm|mm|in|px|pt|pc|%)/iS', '${1}0', $css);

			// Replace 0 0; or 0 0 0; or 0 0 0 0; with 0.
			$css = preg_replace('/\:0(?: 0){1,3}(;|\})/', ':0$1', $css);

			// Fix for issue: #2528142
			// Replace text-shadow:0; with text-shadow:0 0 0;
			$css = preg_replace('/(text-shadow\:0)(;|\})/ie', "strtolower('$1 0 0$2')", $css);

			// Replace background-position:0; with background-position:0 0;
			// same for transform-origin
			$css = preg_replace('/(background\-position|(?:webkit|moz|o|ms|)\-?transform\-origin)\:0(;|\})/ieS', "strtolower('$1:0 0$2')", $css);

			// Shorten colors from rgb(51,102,153) to #336699, rgb(100%,0%,0%) to #ff0000 (sRGB color space)
			// Shorten colors from hsl(0, 100%, 50%) to #ff0000 (sRGB color space)
			// This makes it more likely that it'll get further compressed in the next step.
			$css = preg_replace_callback('/rgb\s*\(\s*([0-9,\s\-\.\%]+)\s*\)(.{1})/i', array($this, 'rgb_to_hex'), $css);
			$css = preg_replace_callback('/hsl\s*\(\s*([0-9,\s\-\.\%]+)\s*\)(.{1})/i', array($this, 'hsl_to_hex'), $css);

			// Shorten colors from #AABBCC to #ABC or short color name.
			$css = $this->compress_hex_colors($css);

			// border: none to border:0, outline: none to outline:0
			$css = preg_replace('/(border\-?(?:top|right|bottom|left|)|outline)\:none(;|\})/ieS', "strtolower('$1:0$2')", $css);

			// shorter opacity IE filter
			$css = preg_replace('/progid\:DXImageTransform\.Microsoft\.Alpha\(Opacity\=/i', 'alpha(opacity=', $css);

					// Remove empty rules.
					$css = preg_replace('/[^\};\{\/]+\{\}/S', '', $css);

					// Some source control tools don't like it when files containing lines longer
					// than, say 8000 characters, are checked in. The linebreak option is used in
					// that case to split long lines after a specific column.
					if ($linebreak_pos !== FALSE && (int) $linebreak_pos >= 0) {
					$linebreak_pos = (int) $linebreak_pos;
					$start_index = $i = 0;
					while ($i < strlen($css)) {
					$i++;
					if ($css[$i - 1] === '}' && $i - $start_index > $linebreak_pos) {
					$css = $this->str_slice($css, 0, $i) . "\n" . $this->str_slice($css, $i);
					$start_index = $i;
					}
					}
					}

					// Replace multiple semi-colons in a row by a single one
					// See SF bug #1980989
					$css = preg_replace('/;;+/', ';', $css);

					// Restore new lines for /*! important comments
					$css = preg_replace('/'. self::NL .'/', "\n", $css);

					// restore preserved comments and strings
					for ($i = 0, $max = count($this->preserved_tokens); $i < $max; $i++) {
						$css = preg_replace('/' . self::TOKEN . $i . '___/', $this->preserved_tokens[$i], $css, 1);
					}

					// Trim the final string (for any leading or trailing white spaces)
					return trim($css);
}

/**
 * Utility method to replace all data urls with tokens before we start
 * compressing, to avoid performance issues running some of the subsequent
 * regexes against large strings chunks.
 *
 * @param string $css
 * @return string
 */
private function extract_data_urls($css)
{
	// Leave data urls alone to increase parse performance.
	$max_index = strlen($css) - 1;
	$append_index = $index = $last_index = $offset = 0;
	$sb = array();
	$pattern = '/url\(\s*(["\']?)data\:/i';

	// Since we need to account for non-base64 data urls, we need to handle
	// ' and ) being part of the data string. Hence switching to indexOf,
	// to determine whether or not we have matching string terminators and
	// handling sb appends directly, instead of using matcher.append* methods.

	while (preg_match($pattern, $css, $m, 0, $offset)) {
		$index = $this->index_of($css, $m[0], $offset);
		$last_index = $index + strlen($m[0]);
		$start_index = $index + 4; // "url(".length()
		$end_index = $last_index - 1;
		$terminator = $m[1]; // ', " or empty (not quoted)
		$found_terminator = FALSE;

		if (strlen($terminator) === 0) {
			$terminator = ')';
		}

		while ($found_terminator === FALSE && $end_index+1 <= $max_index) {
			$end_index = $this->index_of($css, $terminator, $end_index + 1);

			// endIndex == 0 doesn't really apply here
			if ($end_index > 0 && substr($css, $end_index - 1, 1) !== '\\') {
				$found_terminator = TRUE;
				if (')' != $terminator) {
					$end_index = $this->index_of($css, ')', $end_index);
				}
			}
		}

		// Enough searching, start moving stuff over to the buffer
		$sb[] = $this->substring($css, $append_index, $index);

		if ($found_terminator) {
			$token = $this->substring($css, $start_index, $end_index);
			$token = preg_replace('/\s+/', '', $token);
			$this->preserved_tokens[] = $token;

			$preserver = 'url(' . self::TOKEN . (count($this->preserved_tokens) - 1) . '___)';
			$sb[] = $preserver;

			$append_index = $end_index + 1;
		} else {
			// No end terminator found, re-add the whole match. Should we throw/warn here?
			$sb[] = $this->substring($css, $index, $last_index);
			$append_index = $last_index;
		}

		$offset = $last_index;
	}

	$sb[] = $this->substring($css, $append_index);

	return implode('', $sb);
}

/**
 * Utility method to compress hex color values of the form #AABBCC to #ABC or short color name.
 *
 * DOES NOT compress CSS ID selectors which match the above pattern (which would break things).
 * e.g. #AddressForm { ... }
 *
 * DOES NOT compress IE filters, which have hex color values (which would break things).
 * e.g. filter: chroma(color="#FFFFFF");
 *
 * DOES NOT compress invalid hex values.
 * e.g. background-color: #aabbccdd
 *
 * @param string $css
 * @return string
 */
private function compress_hex_colors($css)
{
	// Look for hex colors inside { ... } (to avoid IDs) and which don't have a =, or a " in front of them (to avoid filters)
	$pattern = '/(\=\s*?["\']?)?#([0-9a-f])([0-9a-f])([0-9a-f])([0-9a-f])([0-9a-f])([0-9a-f])(\}|[^0-9a-f{][^{]*?\})/iS';
	$_index = $index = $last_index = $offset = 0;
	$sb = array();
	// See: http://ajaxmin.codeplex.com/wikipage?title=CSS%20Colors
	$short_safe = array(
			'#808080' => 'gray',
			'#008000' => 'green',
			'#800000' => 'maroon',
			'#000080' => 'navy',
			'#808000' => 'olive',
			'#800080' => 'purple',
			'#c0c0c0' => 'silver',
			'#008080' => 'teal',
			'#f00' => 'red'
			);

	while (preg_match($pattern, $css, $m, 0, $offset)) {
		$index = $this->index_of($css, $m[0], $offset);
		$last_index = $index + strlen($m[0]);
		$is_filter = (bool) $m[1];

		$sb[] = $this->substring($css, $_index, $index);

		if ($is_filter) {
			// Restore, maintain case, otherwise filter will break
			$sb[] = $m[1] . '#' . $m[2] . $m[3] . $m[4] . $m[5] . $m[6] . $m[7];
		} else {
			if (strtolower($m[2]) == strtolower($m[3]) &&
					strtolower($m[4]) == strtolower($m[5]) &&
					strtolower($m[6]) == strtolower($m[7])) {
				// Compress.
				$hex = '#' . strtolower($m[3] . $m[5] . $m[7]);
			} else {
				// Non compressible color, restore but lower case.
				$hex = '#' . strtolower($m[2] . $m[3] . $m[4] . $m[5] . $m[6] . $m[7]);
			}
			// replace Hex colors to short safe color names
			$sb[] = array_key_exists($hex, $short_safe) ? $short_safe[$hex] : $hex;
		}

		$_index = $offset = $last_index - strlen($m[8]);
	}

	$sb[] = $this->substring($css, $_index);

	return implode('', $sb);
}

/* CALLBACKS
 * ---------------------------------------------------------------------------------------------
 */

private function replace_string($matches)
{
	$match = $matches[0];
	$quote = substr($match, 0, 1);
	// Must use addcslashes in PHP to avoid parsing of backslashes
	$match = addcslashes($this->str_slice($match, 1, -1), '\\');

	// maybe the string contains a comment-like substring?
	// one, maybe more? put'em back then
	if (($pos = $this->index_of($match, self::COMMENT)) >= 0) {
		for ($i = 0, $max = count($this->comments); $i < $max; $i++) {
			$match = preg_replace('/' . self::COMMENT . $i . '___/', $this->comments[$i], $match, 1);
		}
	}

	// minify alpha opacity in filter strings
	$match = preg_replace('/progid\:DXImageTransform\.Microsoft\.Alpha\(Opacity\=/i', 'alpha(opacity=', $match);

			$this->preserved_tokens[] = $match;
			return $quote . self::TOKEN . (count($this->preserved_tokens) - 1) . '___' . $quote;
			}

			private function replace_colon($matches)
			{
			return preg_replace('/\:/', self::CLASSCOLON, $matches[0]);
			}

			private function replace_calc($matches)
			{
			$this->preserved_tokens[] = preg_replace('/\s?([\*\/\(\),])\s?/', '$1', $matches[0]);
			return self::TOKEN . (count($this->preserved_tokens) - 1) . '___';
			}

			private function rgb_to_hex($matches)
			{
			// Support for percentage values rgb(100%, 0%, 45%);
			if ($this->index_of($matches[1], '%') >= 0){
				$rgbcolors = explode(',', str_replace('%', '', $matches[1]));
				for ($i = 0; $i < count($rgbcolors); $i++) {
					$rgbcolors[$i] = $this->round_number(floatval($rgbcolors[$i]) * 2.55);
				}
			} else {
				$rgbcolors = explode(',', $matches[1]);
			}

			// Values outside the sRGB color space should be clipped (0-255)
			for ($i = 0; $i < count($rgbcolors); $i++) {
				$rgbcolors[$i] = $this->clamp_number(intval($rgbcolors[$i], 10), 0, 255);
				$rgbcolors[$i] = sprintf("%02x", $rgbcolors[$i]);
			}

			// Fix for issue #2528093
			if (!preg_match('/[\s\,\);\}]/', $matches[2])){
				$matches[2] = ' ' . $matches[2];
			}

			return '#' . implode('', $rgbcolors) . $matches[2];
			}

private function hsl_to_hex($matches)
{
	$values = explode(',', str_replace('%', '', $matches[1]));
	$h = floatval($values[0]);
	$s = floatval($values[1]);
	$l = floatval($values[2]);

	// Wrap and clamp, then fraction!
	$h = ((($h % 360) + 360) % 360) / 360;
	$s = $this->clamp_number($s, 0, 100) / 100;
	$l = $this->clamp_number($l, 0, 100) / 100;

	if ($s == 0) {
		$r = $g = $b = $this->round_number(255 * $l);
	} else {
		$v2 = $l < 0.5 ? $l * (1 + $s) : ($l + $s) - ($s * $l);
		$v1 = (2 * $l) - $v2;
		$r = $this->round_number(255 * $this->hue_to_rgb($v1, $v2, $h + (1/3)));
		$g = $this->round_number(255 * $this->hue_to_rgb($v1, $v2, $h));
		$b = $this->round_number(255 * $this->hue_to_rgb($v1, $v2, $h - (1/3)));
	}

	return $this->rgb_to_hex(array('', $r.','.$g.','.$b, $matches[2]));
}

/* HELPERS
 * ---------------------------------------------------------------------------------------------
 */

private function hue_to_rgb($v1, $v2, $vh)
{
	$vh = $vh < 0 ? $vh + 1 : ($vh > 1 ? $vh - 1 : $vh);
	if ($vh * 6 < 1) return $v1 + ($v2 - $v1) * 6 * $vh;
	if ($vh * 2 < 1) return $v2;
	if ($vh * 3 < 2) return $v1 + ($v2 - $v1) * ((2/3) - $vh) * 6;
	return $v1;
}

private function round_number($n)
{
	return intval(floor(floatval($n) + 0.5), 10);
}

private function clamp_number($n, $min, $max)
{
	return min(max($n, $min), $max);
}

/**
 * PHP port of Javascript's "indexOf" function for strings only
 * Author: Tubal Martin http://blog.margenn.com
 *
 * @param string $haystack
 * @param string $needle
 * @param int    $offset index (optional)
 * @return int
 */
private function index_of($haystack, $needle, $offset = 0)
{
	$index = strpos($haystack, $needle, $offset);

	return ($index !== FALSE) ? $index : -1;
}

/**
 * PHP port of Javascript's "substring" function
 * Author: Tubal Martin http://blog.margenn.com
 * Tests: http://margenn.com/tubal/substring/
 *
 * @param string   $str
 * @param int      $from index
 * @param int|bool $to index (optional)
 * @return string
 */
private function substring($str, $from = 0, $to = FALSE)
{
	if ($to !== FALSE) {
		if ($from == $to || ($from <= 0 && $to < 0)) {
			return '';
		}

		if ($from > $to) {
			$from_copy = $from;
			$from = $to;
			$to = $from_copy;
		}
	}

	if ($from < 0) {
		$from = 0;
	}

	$substring = ($to === FALSE) ? substr($str, $from) : substr($str, $from, $to - $from);
	return ($substring === FALSE) ? '' : $substring;
}

/**
 * PHP port of Javascript's "slice" function for strings only
 * Author: Tubal Martin http://blog.margenn.com
 * Tests: http://margenn.com/tubal/str_slice/
 *
 * @param string   $str
 * @param int      $start index
 * @param int|bool $end index (optional)
 * @return string
 */
private function str_slice($str, $start = 0, $end = FALSE)
{
	if ($end !== FALSE && ($start < 0 || $end <= 0)) {
		$max = strlen($str);

		if ($start < 0) {
			if (($start = $max + $start) < 0) {
				return '';
			}
		}

		if ($end < 0) {
			if (($end = $max + $end) < 0) {
				return '';
			}
		}

		if ($end <= $start) {
			return '';
		}
	}

	$slice = ($end === FALSE) ? substr($str, $start) : substr($str, $start, $end - $start);
	return ($slice === FALSE) ? '' : $slice;
}

/**
 * Convert strings like "64M" or "30" to int values
 * @param mixed $size
 * @return int
 */
private function normalize_int($size)
{
	if (is_string($size)) {
		switch (substr($size, -1)) {
			case 'M': case 'm': return $size * 1048576;
			case 'K': case 'k': return $size * 1024;
			case 'G': case 'g': return $size * 1073741824;
		}
	}

	return (int) $size;
}
}
